diff --git a/centreon/plugins/output.pm b/centreon/plugins/output.pm
index 21430c79f..09e9e1880 100644
--- a/centreon/plugins/output.pm
+++ b/centreon/plugins/output.pm
@@ -927,7 +927,7 @@ sub test_eval {
         if ($@) {
             die 'Unsafe code evaluation: ' . $@;
         }
-    } elsif (defined($options{values}) {
+    } elsif (defined($options{values})) {
         # unsafe code execution. don't need to check if it's safe (with no values)
         my $values = $options{values};
         $result = eval "$options{test}";